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Reference.org
Han purple and Han blue
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<p>Han purple and Han blue (also called Chinese purple and Chinese blue) are synthetic <a href="/facts/Barium/IkL09XHQ">barium</a> <a href="/facts/Copper/I8PEE8oX">copper</a> <a href="/facts/Silicate/7NdthSRM">silicate</a> <a href="/facts/Pigment/I3clCYkF">pigments</a> developed in <a href="/facts/China/lTjIXY5p">China</a> and used in ancient and imperial China from the <a href="/facts/Western_Zhou/v0V50ewQ">Western Zhou</a> period (1045–771 BC) until the end of the <a href="/facts/Han_dynasty/hanfxS9D">Han dynasty</a> (c. 220 AD). </p>